<html lang="zh-CN">
<head>
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        .anticon {
            display: inline-block;
            color: inherit;
            font-style: normal;
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        @-webkit-keyframes loadingCircle {
            100% {
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                transform: rotate(360deg);
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        @keyframes loadingCircle {
            100% {
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                transform: rotate(360deg);
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    <meta http-equiv="X-UA-Compatible" content="IE=edge">
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    <meta name="description" content="专业面试刷题网站，助你成为面试达人！支持自由组卷、在线刷题、校招社招斩获大厂offer，求职必备！">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
    <title>【JAVA基础-集合】Java中的HashMap的底层原理实现、工作原理？ - 面试鸭</title>
    <link href="/css4/monokai-sublime.min.css" rel="stylesheet">
    <script src="/js4/highlight.min.js"></script>
    <link rel="stylesheet" href="/css4/umi.153f7631.css">
    <script>
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    .braft-finder [class^="braft-icon-"], .braft-finder [class*=" braft-icon-"] {
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        font-family: 'bf-icons' !important;
        font-style: normal;
        font-weight: normal;
        font-variant: normal;
        text-transform: none;
        /* Better Font Rendering =========== */
        -webkit-font-smoothing: antialiased;
        -moz-osx-font-smoothing: grayscale;
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    .braft-finder .braft-icon-code:before {
        content: "\E903";
    }

    .braft-finder .braft-icon-pause:before {
        content: "\E034";
    }

    .braft-finder .braft-icon-play_arrow:before {
        content: "\E037";
    }

    .braft-finder .braft-icon-bin:before {
        content: "\E9AC";
    }

    .braft-finder .braft-icon-replay:before {
        content: "\E042";
    }

    .braft-finder .braft-icon-close:before {
        content: "\E913";
    }

    .braft-finder .braft-icon-music:before {
        content: "\E90E";
    }

    .braft-finder .braft-icon-camera:before {
        content: "\E911";
    }

    .braft-finder .braft-icon-file-text:before {
        content: "\E926";
    }

    .braft-finder .braft-icon-film:before {
        content: "\E91C";
    }

    .braft-finder .braft-icon-paste:before {
        content: "\E92D";
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        content: "\E980";
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    .braft-finder .braft-icon-media:before {
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    .braft-finder .braft-icon-add:before {
        content: "\E918";
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    .braft-finder .braft-icon-done:before {
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    .braft-finder .braft-icon-help:before {
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    .braft-finder .braft-icon-info:before {
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    .braft-finder .braft-icon-menu:before {
        content: "\E908";
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    .pull-left {
        float: left;
    }

    .pull-right {
        float: right;
    }

    .braft-finder .bf-uploader {
        position: relative;
        height: 370px;
        margin: 0;
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    .braft-finder .bf-uploader.draging .bf-list-wrap,
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    .braft-finder .bf-uploader input::-moz-placeholder {
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    .braft-finder .bf-uploader input::-ms-input-placeholder {
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    .braft-finder .bf-list-wrap {
        position: relative;
        height: 370px;
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    .braft-finder .bf-list-tools {
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        position: absolute;
        top: 0;
        right: 0;
        left: 0;
        height: 20px;
        padding: 0 15px;
        background-color: #fff;
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    .braft-finder .bf-list-tools span {
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        line-height: 20px;
        cursor: pointer;
        user-select: none;
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    .braft-finder .bf-list-tools span[disabled] {
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    .braft-finder .bf-list-tools .bf-select-all,
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        color: #bbb;
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    .braft-finder .bf-list-tools .bf-select-all:hover,
    .braft-finder .bf-list-tools .bf-deselect-all:hover {
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    .braft-finder .bf-list-tools .bf-remove-selected {
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        color: #e74c3c;
    }

    .braft-finder .bf-list-tools .bf-remove-selected:hover {
        color: #c92e1e;
    }

    .braft-finder .bf-list {
        position: absolute;
        z-index: 1;
        top: 30px;
        right: 0;
        left: 0;
        bottom: 0;
        margin: 0;
        padding: 0 10px;
        list-style: none;
        overflow: auto;
    }

    .braft-finder .bf-list::-webkit-scrollbar {
        width: 5px;
        height: 5px;
        background-color: #fff;
    }

    .braft-finder .bf-list::-webkit-scrollbar-track {
        background-color: #fff;
    }

    .braft-finder .bf-list::-webkit-scrollbar-thumb {
        background-color: rgba(0, 0, 0, 0.1);
    }

    .braft-finder .bf-item,
    .braft-finder .bf-add-item {
        position: relative;
        display: block;
        float: left;
        width: 113px;
        height: 113px;
        margin: 5px;
        overflow: hidden;
        border-radius: 3px;
    }

    .braft-finder .bf-item.uploading {
        pointer-events: none;
    }

    .braft-finder .bf-item.error::before {
        display: block;
        content: "\E901";
    }

    .braft-finder .bf-item.error::after {
        position: absolute;
        z-index: 1;
        top: 0;
        right: 0;
        bottom: 0;
        left: 0;
        background-color: rgba(231, 76, 60, 0.8);
        content: '';
    }

    .braft-finder .bf-item.error:hover::after {
        background-color: rgba(231, 76, 60, 0.9);
    }

    .braft-finder .bf-item.error .bf-item-uploading {
        display: none;
    }

    .braft-finder .bf-add-item {
        background-color: #ecedef;
        color: #999;
    }

    .braft-finder .bf-add-item:hover {
        background-color: #e1e2e3;
    }

    .braft-finder .bf-add-item i {
        display: block;
        width: 113px;
        height: 113px;
        font-size: 48px;
        line-height: 113px;
        text-align: center;
    }

    .braft-finder .bf-add-item input {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        opacity: 0;
        cursor: pointer;
    }

    .braft-finder .bf-item::before {
        display: none;
        position: absolute;
        z-index: 2;
        top: 0;
        left: 0;
        width: 113px;
        height: 113px;
        color: #fff;
        font-size: 48px;
        font-family: 'bf-icons';
        line-height: 113px;
        text-align: center;
    }

    .braft-finder .bf-item::after {
        position: absolute;
        z-index: 1;
        top: 0;
        right: 0;
        bottom: 0;
        left: 0;
        background-color: rgba(52, 152, 219, 0);
        content: '';
    }

    .braft-finder .bf-item:hover::after {
        background-color: rgba(52, 152, 219, 0.3);
    }

    .braft-finder .bf-item:hover .bf-item-remove {
        display: block;
    }

    .braft-finder .bf-item.active::before {
        display: block;
        content: "\E912";
    }

    .braft-finder .bf-item.active::after {
        background-color: rgba(52, 152, 219, 0.6);
    }

    .braft-finder .bf-item.active:hover::after {
        background-color: rgba(52, 152, 219, 0.8);
    }

    .braft-finder .bf-item.active:hover .bf-item-remove {
        display: none;
    }

    .braft-finder .bf-item-uploading {
        box-sizing: border-box;
        position: absolute;
        z-index: 3;
        top: 52px;
        left: 10px;
        width: 93px;
        height: 10px;
        overflow: hidden;
        background-color: rgba(255, 255, 255, 0.3);
        border-radius: 5px;
        box-shadow: 0 0 0 100px rgba(0, 0, 0, 0.5);
    }

    .braft-finder .bf-item-uploading-bar {
        height: 10px;
        background-color: #3498db;
        border-radius: 0;
    }

    .braft-finder .bf-item-remove {
        display: none;
        position: absolute;
        z-index: 2;
        top: 0;
        right: 0;
        width: 28px;
        height: 28px;
        color: #fff;
        font-size: 18px;
        line-height: 28px;
        text-align: center;
        cursor: pointer;
    }

    .braft-finder .bf-item-remove:hover {
        color: #e74c3c;
    }

    .braft-finder .bf-item-title {
        display: none;
        box-sizing: border-box;
        position: absolute;
        z-index: 2;
        bottom: 0;
        left: 0;
        width: 100%;
        height: 40px;
        padding: 0 5px;
        overflow: hidden;
        background-image: linear-gradient(rgba(0, 0, 0, 0), black);
        color: #fff;
        font-size: 12px;
        line-height: 55px;
        text-align: center;
        text-overflow: ellipsis;
        white-space: nowrap;
    }

    .braft-finder .bf-image {
        width: 100%;
        height: 100%;
        background-color: #eee;
        user-select: none;
    }

    .braft-finder .bf-image img {
        display: block;
        width: 100%;
        height: 100%;
        object-fit: cover;
    }

    .braft-finder .bf-video {
        background-color: #8e44ad;
    }

    .braft-finder .bf-audio {
        background-color: #f39c12;
    }

    .braft-finder .bf-embed {
        background-color: #f1c40f;
    }

    .braft-finder .bf-icon {
        display: block;
        width: 113px;
        height: 113px;
        overflow: hidden;
        color: #fff;
        text-align: center;
        text-decoration: none;
    }

    .braft-finder .bf-icon i, .braft-finder .bf-icon span {
        display: block;
    }

    .braft-finder .bf-icon i {
        margin-top: 35px;
        font-size: 24px;
    }

    .braft-finder .bf-icon span {
        width: 103px;
        margin: 10px auto;
        overflow: hidden;
        font-size: 12px;
        text-overflow: ellipsis;
        white-space: nowrap;
    }

    .braft-finder .bf-drag-uploader {
        box-sizing: border-box;
        position: absolute;
        z-index: 2;
        top: 0;
        right: 15px;
        left: 15px;
        height: 100%;
        background-color: #fff;
        border: dashed 1px #bbb;
        text-align: center;
        opacity: 0;
        pointer-events: none;
    }

    .braft-finder .bf-drag-uploader:hover, .braft-finder .bf-drag-uploader.draging {
        background-color: #f1f2f3;
    }

    .braft-finder .bf-drag-uploader.active {
        opacity: 1;
        pointer-events: auto;
    }

    .braft-finder .bf-uploader-buttons {
        height: 370px;
        margin: auto;
        text-align: center;
    }

    .braft-finder .bf-drag-tip {
        display: inline-block;
        margin-top: 150px;
        color: #ccc;
        text-align: center;
        font-size: 28px;
        font-weight: normal;
        line-height: 40px;
    }

    .braft-finder .bf-drag-tip input {
        position: absolute;
        top: 0;
        right: 0;
        bottom: 0;
        left: 0;
        width: 100%;
        height: 100%;
        opacity: 0;
        color: #fff;
        text-indent: -100px;
        cursor: pointer;
    }

    .braft-finder .bf-manager-footer {
        height: 36px;
        margin: 10px 0;
        padding: 0 15px;
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    .braft-finder .bf-manager-footer .button {
        float: right;
        height: 36px;
        margin-left: 5px;
        padding: 0 35px;
        font-size: 12px;
        font-weight: 700;
        border: none;
        border-radius: 3px;
        cursor: pointer;
    }

    .braft-finder .bf-manager-footer .button-insert {
        color: #fff;
        background-color: #3498db;
    }

    .braft-finder .bf-manager-footer .button-insert:hover {
        background-color: #2084c7;
    }

    .braft-finder .bf-manager-footer .button-insert[disabled] {
        opacity: .3;
        pointer-events: none;
        filter: grayscale(0.4);
    }

    .braft-finder .bf-manager-footer .button-cancel {
        color: #999;
        background-color: #e8e8e9;
    }

    .braft-finder .bf-manager-footer .button-cancel:hover {
        background-color: #d8d8d9;
    }

    .braft-finder .bf-toggle-external-form {
        color: #666;
        font-size: 12px;
        line-height: 36px;
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    .braft-finder .bf-toggle-external-form span {
        color: #bbb;
        line-height: 16px;
        cursor: pointer;
        user-select: none;
    }

    .braft-finder .bf-toggle-external-form span:hover {
        color: #3498db;
    }

    .braft-finder .bf-toggle-external-form span i {
        position: relative;
        top: 2px;
        font-size: 16px;
    }

    .braft-finder .bf-add-external {
        position: absolute;
        z-index: 3;
        top: 0;
        right: 0;
        bottom: 0;
        left: 0;
        background-color: #fff;
    }

    .braft-finder .bf-add-external input {
        border: solid 1px rgba(0, 0, 0, 0.3);
        border: solid 0.5px rgba(0, 0, 0, 0.3);
        box-shadow: none;
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    .braft-finder .bf-add-external input:focus {
        border-color: #3498db;
        box-shadow: none;
    }

    .braft-finder .bf-external-form {
        width: 500px;
        max-width: 90%;
        margin: 91px auto 0 auto;
    }

    .braft-finder .bf-external-input {
        position: relative;
        width: 100%;
        height: 40px;
        margin-bottom: 10px;
    }

    .braft-finder .bf-external-input div {
        position: absolute;
        top: 0;
        right: 85px;
        left: 0;
        height: 40px;
    }

    .braft-finder .bf-external-input input,
    .braft-finder .bf-external-input textarea {
        display: block;
        box-sizing: border-box;
        width: 100%;
        height: 40px;
        padding: 0 10px;
        border: none;
        border-radius: 3px;
        outline: none;
        box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.3);
        color: #999;
        font-size: 18px;
    }

    .braft-finder .bf-external-input input:focus,
    .braft-finder .bf-external-input textarea:focus {
        box-shadow: inset 0 0 0 1px #3498db;
    }

    .braft-finder .bf-external-input textarea {
        height: 100px;
        font-size: 14px;
    }

    .braft-finder .bf-external-input button {
        position: absolute;
        top: 0;
        right: 0;
        width: 80px;
        height: 40px;
        background-color: #3498db;
        border: none;
        border-radius: 3px;
        color: #fff;
        font-size: 14px;
        font-weight: bold;
        cursor: pointer;
    }

    .braft-finder .bf-external-input button:disabled {
        opacity: .3;
        pointer-events: none;
        filter: grayscale(0.4);
    }

    .braft-finder .bf-external-input button:hover {
        background-color: #2084c7;
    }

    .braft-finder .bf-switch-external-type {
        overflow: hidden;
        text-align: center;
    }

    .braft-finder .bf-switch-external-type button {
        width: auto;
        height: 30px;
        margin: 10px 5px;
        padding: 0 10px;
        background-color: #e8e9ea;
        border: none;
        border-radius: 3px;
        color: #999;
        font-size: 12px;
        cursor: pointer;
    }

    .braft-finder .bf-switch-external-type button:hover {
        background-color: #d8d9da;
    }

    .braft-finder .bf-switch-external-type button:only-child {
        display: none;
    }

    .braft-finder .bf-switch-external-type[data-type="IMAGE"] [data-type="IMAGE"],
    .braft-finder .bf-switch-external-type[data-type="VIDEO"] [data-type="VIDEO"],
    .braft-finder .bf-switch-external-type[data-type="AUDIO"] [data-type="AUDIO"],
    .braft-finder .bf-switch-external-type[data-type="EMBED"] [data-type="EMBED"],
    .braft-finder .bf-switch-external-type[data-type="FILE"] [data-type="FILE"] {
        background-color: #3498db;
        color: #fff;
    }

    .braft-finder .bf-external-tip {
        display: block;
        margin-top: 15px;
        color: #ccc;
        font-size: 12px;
        text-align: center;
    }
    </style>
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                                                    <div><p style="font-size: 15px;">解析：</p>
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                                                                        <blockquote>工作原理分析</blockquote>
                                                                        <p>
                                                                            Java中的HashMap是以键值对(key-value)的形式存储元素的。HashMap需要一个hash函数，它使用hashCode()和equals()方法来向集合/从集合添加和检索元素。当调用put()方法的时候，HashMap会计算key的hash值，然后把键值对存储在集合中合适的索引上。如果key已经存在了，value会被更新成新值</p>
                                                                        <p>HashMap的一些重要的特性是它的容量(capacity)，负载因子(load
                                                                            factor)和扩容极限(threshold resizing)</p>
                                                                        <blockquote>对比jdk1.7和jdk1.8版本的不同</blockquote>
                                                                        <p>
                                                                            底层数据结构不一样，1.7是数组+链表，1.8则是数组+链表+红黑树结构（当链表长度大于8，转为红黑树）。</p>
                                                                        <p>
                                                                            JDK1.8中resize()方法在表为空时，创建表；在表不为空时，扩容；而JDK1.7中resize()方法负责扩容，inflateTable()负责创建表。</p>
                                                                        <p>
                                                                            1.8中没有区分键为null的情况，而1.7版本中对于键为null的情况调用putForNullKey()方法。但是两个版本中如果键为null，那么调用hash()方法得到的都将是0，<strong>所以键为null的元素都始终位于哈希表table【0】中。</strong>
                                                                        </p>
                                                                        <p>
                                                                            当1.8中的桶中元素处于链表的情况，遍历的同时最后如果没有匹配的，直接将节点添加到链表尾部；而1.7在遍历的同时没有添加数据，而是另外调用了addEntry()方法，将节点添加到链表头部。</p>
                                                                        <p>
                                                                            1.7中新增节点采用头插法，1.8中新增节点采用尾插法。这也是为什么1.8不容易出现环型链表的原因。</p>
                                                                        <p>
                                                                            1.7中是通过更改hashSeed值修改节点的hash值从而达到rehash时的链表分散，而1.8中键的hash值不会改变，rehash时根据（hash&amp;oldCap）==0将链表分散。</p>
                                                                        <p>
                                                                            1.8rehash时保证原链表的顺序，而1.7中rehash时有可能改变链表的顺序（头插法导致）。</p>
                                                                        <p>在扩容的时候：1.7在插入数据之前扩容，而1.8插入数据成功之后扩容。</p></div>
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                                                                    <div class="ant-space-item"><span>2022-05-30</span>
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                                                                    什么是static？它的作用是什么？</h5></a>
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                                                                    <div class="ant-space-item"><span>2022-05-28</span>
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                                                                    一个文章信息流页面按时间例序排序，分页每页10条拉取，用户A在拉取完第一页后用户B发布了一篇新文章，此时用户A拉取第二页会出现什么情况?怎么解决?</h5>
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                                                                    <div class="ant-space-item"><span>2022-05-23</span>
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